Any good tools or methods to monitor exchange 2010 EWS performance

We are seeing some high RPC latency on our exchange servers and beleive it may be due to an EWS application. I am trying to get some metrics from our exchange servers EWS instances to determine if this is the case.

I know perfmon can monitor some EWS counters but hopefully there is somethign a little better out there.

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I ended up setting up a trial of splunk and dumping several days worth of the IIS logs into it for analysis. After everything was indexed we were able to see that there was indeed a service account that was hammering our exchange servers with requests.